A magnetic field is a region of space in which a magnetic material experiences a force.
A magnetic field can be represented by field lines that show the shape of the field.
Lines close together represent a strong field and lines widely spaced represent a weak field.Field lines are always complete loops. We draw them in the direction from a north to a south pole. [The direction of the field is the direction of the force that would act on an isolated north pole placed there.]
Magnetic materials include iron, cobalt and nickel.
Magnetic fields are produced by electric currents, which can be macroscopic currents in wires, or microscopic currents associated with electrons in atomic orbits.
Magnetic field sources are essentially dipolar in nature, having a north and south magnetic pole.
The SI unit for magnetic field is the Tesla, which can be seen from the magnetic part of the
A smaller magnetic field unit is the Gauss (1 Tesla = 10,000 Gauss).
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